bisecting cause commit starting from f4e087c666f54559cb4e530af1fbfc9967e14a15 building syzkaller on 65a7a8540d29e72622fca06522587f7e66539fd3 testing commit f4e087c666f54559cb4e530af1fbfc9967e14a15 with gcc (GCC) 8.1.0 kernel signature: 405ea3320158591f186dd83893122782870b0254a962e1d67ca11c69f311a7ce all runs: crashed: WARNING in smk_write_net4addr testing release v5.10 testing commit 2c85ebc57b3e1817b6ce1a6b703928e113a90442 with gcc (GCC) 8.1.0 kernel signature: 5035332b8f978c13779dd8be0ba1e4ce5debb9716b94f5b4b7dce31f48ab366b all runs: crashed: WARNING in smk_write_net4addr testing release v5.9 testing commit bbf5c979011a099af5dc76498918ed7df445635b with gcc (GCC) 8.1.0 kernel signature: 2f0cdf8aed36b324203f4cc1de1d4131b2298d9a637c07231f4713cb001a6b91 all runs: crashed: WARNING in smk_write_net4addr testing release v5.8 testing commit bcf876870b95592b52519ed4aafcf9d95999bc9c with gcc (GCC) 8.1.0 kernel signature: e83a67d5838f5deb0028c90a4cb7c18a3b7a965c266778c56c081490bd927d3c all runs: crashed: WARNING in smk_write_net4addr testing release v5.7 testing commit 3d77e6a8804abcc0504c904bd6e5cdf3a5cf8162 with gcc (GCC) 8.1.0 kernel signature: c058fd59186be6bc0d55f520f237d24ae012c24d54deae6dcf602bb77313d941 all runs: crashed: WARNING in smk_write_net4addr testing release v5.6 testing commit 7111951b8d4973bda27ff663f2cf18b663d15b48 with gcc (GCC) 8.1.0 kernel signature: 504766679c547653d15adbae15ac2db4a908b85f3e0d4c23b00526d43ff6f350 all runs: crashed: WARNING in smk_write_net4addr testing release v5.5 testing commit d5226fa6dbae0569ee43ecfc08bdcd6770fc4755 with gcc (GCC) 8.1.0 kernel signature: 1f9202d0c45623ca8f7f3cf7f0657516cdb12510634c9ad5b4808f54aca4cc3a all runs: crashed: WARNING in smk_write_net4addr testing release v5.4 testing commit 219d54332a09e8d8741c1e1982f5eae56099de85 with gcc (GCC) 8.1.0 kernel signature: 127ffbddd34a6f55760997d26c5f9fce5e23f3d1b68b2eb2447b184b3c59958c all runs: crashed: WARNING in smk_write_net4addr testing release v5.3 testing commit 4d856f72c10ecb060868ed10ff1b1453943fc6c8 with gcc (GCC) 8.1.0 kernel signature: 67dd518639c5e2e080e7a9ebc7bc7d8e5d264dc0dfb8d14df6c513ecadb8ec73 all runs: crashed: WARNING in smk_write_net4addr testing release v5.2 testing commit 0ecfebd2b52404ae0c54a878c872bb93363ada36 with gcc (GCC) 8.1.0 kernel signature: 9438469d4edb032a2109f93c2ee4862b41c482da3c4049fe678bc636cbb52007 all runs: crashed: WARNING in smk_write_net4addr testing release v5.1 testing commit e93c9c99a629c61837d5a7fc2120cd2b6c70dbdd with gcc (GCC) 8.1.0 kernel signature: 20b979a4c2d3b41adc8eeb85bfcd328a2715cd932fb180b00ad8cf80b4712dff all runs: crashed: WARNING in smk_write_net4addr testing release v5.0 testing commit 1c163f4c7b3f621efff9b28a47abb36f7378d783 with gcc (GCC) 8.1.0 kernel signature: 80b5e353e1895803871f3393bbaf0c59eef79e5f86529b2080952b02853f5a11 all runs: crashed: WARNING in smk_write_net4addr testing release v4.20 testing commit 8fe28cb58bcb235034b64cbbb7550a8a43fd88be with gcc (GCC) 8.1.0 kernel signature: 91bbf9d90dbe167c9fbda6acd850e1b44cebbdc739154e7eaaa86d49bdd33d94 all runs: crashed: WARNING in smk_write_net4addr testing release v4.19 testing commit 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d with gcc (GCC) 8.1.0 kernel signature: 369a231da448b733c2c8ce385115c5502a60258dd9a7045cf0597fadfbb0f03a all runs: crashed: WARNING in smk_write_net4addr testing release v4.18 testing commit 94710cac0ef4ee177a63b5227664b38c95bbf703 with gcc (GCC) 8.1.0 kernel signature: 57567e6761647b72041bd07c979cf316e02a9238d14a32e270987dec69454340 all runs: crashed: WARNING in smk_write_net4addr testing release v4.17 testing commit 29dcea88779c856c7dc92040a0c01233263101d4 with gcc (GCC) 8.1.0 kernel signature: 758c26085579369d8f751d1230b426ba8ed0af5f49ff427e1ff1f773b112079c all runs: crashed: WARNING in smk_write_net4addr testing release v4.16 testing commit 0adb32858b0bddf4ada5f364a84ed60b196dbcda with gcc (GCC) 8.1.0 kernel signature: 7c6436b1ae7f884cb2766d6e9af3627e46569a514202dbb2af9235c319bc52af all runs: crashed: WARNING in smk_write_net4addr testing release v4.15 testing commit d8a5b80568a9cb66810e75b182018e9edb68e8ff with gcc (GCC) 8.1.0 kernel signature: 8b4842704c8f506775e360ac5c3622c24f9400faeea68cf177b09bd32ea81af7 all runs: crashed: WARNING in smk_write_net4addr testing release v4.14 testing commit bebc6082da0a9f5d47a1ea2edc099bf671058bd4 with gcc (GCC) 8.1.0 kernel signature: 69338bce9f8662eba01ceef44905470963f8c3f2819a5ae4e9736020c86cdaae all runs: crashed: WARNING in smk_write_net4addr testing release v4.13 testing commit 569dbb88e80deb68974ef6fdd6a13edb9d686261 with gcc (GCC) 8.1.0 kernel signature: 569a4aca54d27351950acb032af61659c021ca698993ae1330b57a5b40ee5b34 all runs: crashed: WARNING in smk_write_net4addr testing release v4.12 testing commit 6f7da290413ba713f0cdd9ff1a2a9bb129ef4f6c with gcc (GCC) 8.1.0 kernel signature: 6f2f189e52bf188515cf121fccab1e4c0ea63908806fe66058c9d7082fe0dee1 all runs: basic kernel testing failed: BUG: sleeping function called from invalid context in tap_get_minor testing release v4.11 testing commit a351e9b9fc24e982ec2f0e76379a49826036da12 with gcc (GCC) 7.3.0 kernel signature: fd847a6c82e5dfe9d431dffc92209f50ef74cb7f5799a24108d11b66e0b4b38f all runs: basic kernel testing failed: BUG: sleeping function called from invalid context in tap_get_minor testing release v4.10 testing commit c470abd4fde40ea6a0846a2beab642a578c0b8cd with gcc (GCC) 5.5.0 kernel signature: 4d7cb830836eb717e8ec7c6f7e2eb982ac76c0013ea1f37de20703d58d62162a all runs: crashed: WARNING in smk_write_net4addr testing release v4.9 testing commit 69973b830859bc6529a7a0468ba0d80ee5117826 with gcc (GCC) 5.5.0 kernel signature: 7fc6da3200f90baa681a8cfc69f7aa8aa584b2466e0f0f1d82d31498747c3d2c all runs: crashed: WARNING in smk_write_net4addr testing release v4.8 testing commit c8d2bc9bc39ebea8437fd974fdbc21847bb897a3 with gcc (GCC) 5.5.0 kernel signature: bba56ecff07aec0de6bd1d17412d00a38bbf826cfce286f5650ce73a86c6a7e5 run #0: crashed: WARNING in smk_write_net4addr run #1: crashed: WARNING in corrupted run #2: crashed: WARNING in smk_write_net4addr run #3: crashed: WARNING in smk_write_net4addr run #4: crashed: WARNING in smk_write_net4addr run #5: crashed: WARNING in smk_write_net4addr run #6: crashed: WARNING in smk_write_net4addr run #7: crashed: WARNING in smk_write_net4addr run #8: crashed: WARNING in smk_write_net4addr run #9: crashed: WARNING in smk_write_net4addr testing release v4.7 testing commit 523d939ef98fd712632d93a5a2b588e477a7565e with gcc (GCC) 5.5.0 kernel signature: f2c480f67201ad4e2bf9d90beb7168bb2e19862083ade61c46e87dad1ef2ddc4 all runs: crashed: WARNING in alloc_kmem_pages testing release v4.6 testing commit 2dcd0af568b0cf583645c8a317dd12e344b1c72a with gcc (GCC) 5.5.0 kernel signature: 5477e3b0ae45b8c021b87add7dc9efa25f4eb08f4a25d9e927eff6f594ea7dd5 all runs: crashed: WARNING in sysfs_warn_dup revisions tested: 27, total time: 3h30m35.961869366s (build: 2h10m0.734725179s, test: 1h16m40.289417811s) the crash already happened on the oldest tested release commit msg: Linux 4.6 crash: WARNING in sysfs_warn_dup bond0: Enslaving bond_slave_0 as an active interface with an up link IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready bond0: Enslaving bond_slave_1 as an active interface with an up link ------------[ cut here ]------------ WARNING: CPU: 1 PID: 7916 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 fs/sysfs/dir.c:30 sysfs: cannot create duplicate filename '/class/macvtap/tap50' Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 7916 Comm: syz-executor.1 Not tainted 4.6.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 0000000000000000 ffff8800b1226fc8 ffffffff82da4dd2 ffffffff8667aec0 ffff8800b12270a0 ffffffff8672c8c0 ffffffff818db72b 0000000000000009 ffff8800b1227090 ffffffff815c7a54 0000000041b58ab3 ffffffff87779893 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0x136/0x1d4 lib/dump_stack.c:51 [] panic+0x1af/0x348 kernel/panic.c:152 [] __warn+0x18d/0x1b0 kernel/panic.c:504 [] warn_slowpath_fmt+0x92/0xb0 kernel/panic.c:527 [] sysfs_warn_dup+0x7b/0xa0 fs/sysfs/dir.c:30 [] sysfs_do_create_link_sd.isra.0+0xd1/0xf0 fs/sysfs/symlink.c:51 [] sysfs_do_create_link fs/sysfs/symlink.c:80 [inline] [] sysfs_create_link+0x43/0xb0 fs/sysfs/symlink.c:92 [] device_add_class_symlinks drivers/base/core.c:891 [inline] [] device_add+0x6a1/0x1400 drivers/base/core.c:1086 [] device_create_groups_vargs+0x1c8/0x220 drivers/base/core.c:1709 [] device_create_vargs drivers/base/core.c:1749 [inline] [] device_create+0x88/0xa0 drivers/base/core.c:1785 [] macvtap_device_event+0x1c4/0x2a0 drivers/net/macvtap.c:1298 [] notifier_call_chain+0x8b/0x170 kernel/notifier.c:93 [] __raw_notifier_call_chain kernel/notifier.c:394 [inline] [] raw_notifier_call_chain+0x11/0x20 kernel/notifier.c:401 [] call_netdevice_notifiers_info+0x47/0x80 net/core/dev.c:1643 [] call_netdevice_notifiers net/core/dev.c:1659 [inline] [] register_netdevice+0x8e8/0xd00 net/core/dev.c:7027 [] macvlan_common_newlink+0x8b9/0x1090 drivers/net/macvlan.c:1316 [] macvtap_newlink+0xbf/0x110 drivers/net/macvtap.c:471 [] rtnl_newlink+0xd4b/0x1230 net/core/rtnetlink.c:2466 [] rtnetlink_rcv_msg+0x222/0x680 net/core/rtnetlink.c:3513 [] netlink_rcv_skb+0x242/0x350 net/netlink/af_netlink.c:2277 [] rtnetlink_rcv+0x25/0x30 net/core/rtnetlink.c:3519 [] netlink_unicast_kernel net/netlink/af_netlink.c:1214 [inline] [] netlink_unicast+0x3da/0x560 net/netlink/af_netlink.c:1240 [] netlink_sendmsg+0x9bb/0xb40 net/netlink/af_netlink.c:1786 [] sock_sendmsg_nosec net/socket.c:612 [inline] [] sock_sendmsg+0xb5/0xf0 net/socket.c:622 [] SYSC_sendto net/socket.c:1648 [inline] [] SyS_sendto+0x1ca/0x290 net/socket.c:1616 [] entry_SYSCALL_64_fastpath+0x23/0xc1 Kernel Offset: disabled